Rotary sheet-metal cutter



F, FRENGLE.. ROTARY SHEET METAL CUTTER. APPLICATION FILED FEB. 17| 1920.

1,853,526.. I Patntasept. 21,1920.

2 SHEETS-SHEET v1.

l III 2l nimm 4 IN ENTOR wwe/f j/ BY Uf() Y( ATTORN? l ether pententhereofoiairnn srarne earner i FRED FRznvofLn,l on cornrr,V CALIFORNIA.

Application ined rebfu'fy 17, 19,20.. lserial N0.- eoel.

-lar openings in sheet metal, and in which a rotating shaft carries atone vend a ycrossbar provided with acutting diskadapted to operateinconjunction ,with a die. f

An object of the inventionis to provide a Crees-bar vthat vCan feeadineted relative te. the shaft so that openingsof different diinensionsmay be cut.

,A further Object of the wenn@ ,is i@ `provide interchangeable diestowork inl conjunction with theAcntting-ineans.r

A still further object `s to'provide dies with :a plnralityef sreeveeeenfurtherance win appear athenescription proceeds, it beingunderstoodcthat Vchanges maybe'rnade in V theenact embodi' AInent.oitnlyrnpneYelnente ffrelntheee ener/n in the accompanyingdrawings, described lin thespecication or as pointedV out `in theclaims.v

In the drawings, ,throughout which like referencecharactersyrepresentlike parts:

Figure v,1 is a side elevation of the.` cutter and a portion of `a postor standardto which l .the cutter issecured.

.,Fg. 2 ,1S aseetenal Yiew Online afa, Flg. 1.

Fig. V3 is Va vertical sectional view of a portion of the device.

ig. 4 ls avertical sectional View. of. an-

i 'Figs 5,6, Q/8V and oftheinvention.A e j I Fis' l-OzS a plan View'0f-.theiran1a ,Show- 9 are rviews v of Vportions .eine one efthedesdepeeed thereon- ,Y

Referring, to the Vdrawings in deta-ilf'v The, numeral v1 designates-` afranie, feennprensa Iverteal niernberieeenregt to a 1 Standaarden peet 3lei/,means eftaetenlnsnevices 4, ,an upperbracket l5, an intermediateAbracket 6 andy a lower bracketgor. die table 17 In the freeend of thebracket 5 lis va vthreaded vertical opening V8, in whichA is-operatively disposed a screw L9, to thefupper end of which is rigidlysecured an Opating Hwheel 10. The lower end oi the screwr 9,is

' operator yfor in operation.V v

tion'and yis provided witha socket "114,1,at the .base of whichis aballseat 12.

v Specicationof Letters Patent. Paftlted 1,920. l

larger, diametrically,'thannits threaded lpOr- Adjacent the free lend oisaidenlarged A portion ofthe screw 9, are twoyoppositely disposedthreaded openings 1.3, 13,which connect with the socket 11v andare'ttedwith' i fnitneppeetely depeeedansee ,155155 hav- .lne horizontallydiepeeed openingS lereeieterinevtn Openings 117 extending nennentally'threnehfflansee 18,1%@ apap 19 removably securedto saiolfitree-end of the The free end of-the-:bracketi'is provided screws 14, 14. ThefreeQendso ,the'shanks of the screwsy 14,14, project "a distance `intothe eeeket 1,1;

bracket 6, by means of l epenneele, 17- The eenetrneteniand arrangementofthe nap and .the free .enel nf vthe bracket Gris suchso as to form avertical opening 20.7111 Wneh `is fitted. y.fen leneitnd.-

nnal aS Well Vvas for retaralnievementitnean- .terrnediatejsection of lashaft 21. 1

. ,The upperk end off the 2.1 kis fnetreally ,redneed andtted,rotatably, inte the socket 1,1, and has an'annular groovej22 adapted 'toreceive" the free ends of the retaining screws 14, V14, Thenupperlen'dofvsaid reduced portion IisHprovided with a -ball seat 2-3 registering.with the ball seat12l inthe-screw `9.4 Said ball seats carry abear# jing ball24, which is adaptedto-receive any end `thrust ,between ,the"Sferew 'V9 and the The retaining screws 14, 14, are intended,pto-.engage they groove22 and thereby lnor! e nially supportthe shari;.Qlfwhen ,that inein- V ,ber isnotbeing'supportedV by the dietablef'?,

c 25 `designates an operating wheelvrigidly `secured to the shaft 21`adjacent its upper end' and y*is adapted to .be engaged.bythe' 7rotating the shaft i in either di rection.

, Extending laterally the shaftZl, adjacent itslower end, isvan'openingfQt pron engage' threads v28"ot1 a `cross-bar 29,.the

-.100 vided with screw threads-27 adapted to" cross-barv29 being movable,longitudinally adapted ,to screw up tiglyltlyagainstV oppositevsides oftheshaft 21 to prevent said cross-bar from turning whenv the machine iseither direction-by rotating it `in the A yproper directionpintheopening'f. f i s v .30 are nutson the cross-bar. 29which areV One endof the cross-bar 29 is diametrically reduced thereby forming an offset31 and a bearing pintle 32, the latter disposed in aXial alinement withthe cross-bar and provided at its free end withI threads 33 engaged by anut 34.

35 designates a cutting disk having on its peripheryV an annular cuttingedge 36 and a central opening 37 through which extends the pintle 32,the arrangement being such that the disk 35l may freely rotate upon saidpintle, between the nut 34 and the offset 31.

Upon the cross-bar 29, on opposite sides of the shaft 21 from the disk35, is disposed a Asleeve 38 having threads 39 engaging the threads 23,and an annular flange 40. The sleeve 33 may be moved either outwardly orinwardly upon the cross-bar 29 by rotating it in the properv direction.

41 is a jam-nut engaging the threads 28 and adapted to be screwed uptightly 'against the free end of the sleeve 38 to prevent said sleevefrom Vturning upon the cross-bar 29.

Upon the sleeve 38, intermediate the flange 40 and the nut 41,V isrotatably'mounted a relier 43, the functions of which will hereinafterbe fully described. Y

rlhe die table 7 is provided upon its upper side with two spaced apartribs 44, which extend transversely relative to the table and carry setscrews 45, which engage opposite 'sides of a die 46 seated on said tablebetween the ribs 44. rThe width of said die 43 is less than the distancebetween the ribs, thereby permitting the die to be shifted upon thetable'so that it may be brought into proper alinement with the shaft 21which it underlies.

After the die 46 has been placed in proper position on the die table 7,the screws 45 are intended to be turned Vup until they bear equallytight against its sides. kBy loosening the screws 45,Y the die may beremoved fromthe table 7 and another, die substituted. Y 1

Upon the upper or face side of the diev46 is cut a central conicalyrecess 47, which during operation of the cutter, receives a conicalprojection 48 at the lower end of the shaft 21, which is intended toassist in alining the die relative to the shaft 21 andthe cutting disk35 before the screws 44 are tightened. rllhe die 46 is further providedYupon Yits upper side with annular grooves 49, in either of whichgrooves the disk may be made to travel when the cutter is inoperation.

lVhile the `device illustrated showsa die provided with two grooves, itis to be understood that the die is not limited to any particular numberof grooves, and that, if

desired, it may be constructed with only one groove, or it may have morethan two grooves.`

By loosening the nuts 30, the cross-bar 29 ytween the die and the disk35.

Ymay be rotated to shift it longitudinally of V29 above the die 46 so asto permit the sheet metal intended to be cut to be inserted be- Thewheel 10 and screw 9 are then rotated in the opposite direction to'lowerthe shaft 21 and its cross-bar 29, until the disk 35 engages the saidsheet metal, when by rotating the wheel y 25 the shaftl 21 will be madeto rotate in the 'at times cause said metal to buckle up, and

in order to prevent orv limit said upward buckling of the metal, l haveprovided the roller 43, which is intended to roll along on the metal asthe shaft 21 revolves, or it may be so constructed and arranged as tonormally travel a slight distance above the metal and to engage thesame4 only when it bends or buckles up.

Having described my invention, what l claim and Vdesire to secure byLetters Patent, is Y 1. A rotary sheet metal cutter comprising a framehaving a pair of spaced apart outstanding brackets disposed in the samevertical plane, a vertically disposed screw carried'by the upper one ofsaid brackets, a vertically disposed shaft rotatably and slidablycarriedV by the other of said brackets, said screw and shaft beingdisposed in axial alinement with eachother and having one end pivotallyconnected together, a screwthreaded cross-bar carried by the free end ofsaid shaft and having its ends extending at substantially right anglesfrom opposite sides of the shaft, saidV cross-bar movable longitudinallyin either direction by rotating it relative to the shaft, nuts on saidcrossdisposed screw carried by the free end of the ment with said screwand having its upper.

end movably connected to the lower end thereof, said shaft being movableboth longitudinally and rotatably relative to ,itsV

bracket, a screw threaded opening extending horizontally through thelower end of said shaft, a screw disposed in said opening vand havingits free ends' projecting outwardly a distance from either side thereof,a cutting disk rotatably mounted on one end of said last named screw,and means coperating with said disk for cutting-circular openings insheet metal.

In testimony whereof, I have hereunto set my hand this `1st day ofJanuary, 1920.

J FRED FRENGLE.

